PCBA printed circuit board structure of micro inverter

Abstract

The utility model relates to a PCBA printed circuit board structure of a micro inverter, and belongs to the technical field of circuits. According to the PCBA printed circuit board structure of the miniature inverter, the transformer is arranged at the center line position of the front surface of the substrate, the front surface and the back surface of the substrate at one side of the transformer are the transformer primary side element area, and the other side of the substrate is the transformer secondary side element area, so that the elements are uniformly distributed, the gravity center balance of the PCBA is ensured, and meanwhile, the area is smaller than 505cm < 2 >; and the weight is controlled, so that the whole PCBA is small and exquisite, and subsequent assembly and application are facilitated. The PCBA printed circuit board structure of the micro inverter is simple in structure and low in cost, and can be widely applied to application occasions of various high-power photovoltaic products.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, especially to the technical field of PCBA structures, and specifically refers to a printed circuit board structure of a micro-inverter PCBA. Background Art

[0002] In the field of photovoltaic power generation, a micro-inverter is used to convert the direct current generated by photovoltaic modules into alternating current suitable for grid connection, realizing DC-AC conversion. At the same time, it needs to have functions such as overvoltage protection, overcurrent protection, and short-circuit protection to ensure that the system can respond quickly in abnormal situations and avoid equipment damage.

[0003] With the progress of technology, micro-inverters need to meet the requirements of larger power equipment. Therefore, there are more components on the micro-inverter PCBA, the overall size is larger, and the space requirements are higher. Moreover, the conventional PCBA structure design places components such as transformers and inductors on one side close to the DC input end, which makes the center of gravity of the micro-inverter PCBA shift towards this side, which has certain adverse effects on subsequent assembly, use, etc.

[0004] Therefore, how to provide a printed circuit board structure of a micro-inverter PCBA with a small size, balanced center of gravity, and meeting the needs of high-power application scenarios has become an urgent problem to be solved in this field. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the above-mentioned shortcomings in the prior art and provide a printed circuit board structure of a micro-inverter PCBA with a small size and a balanced center of gravity.

[0006] In order to achieve the above purpose, the printed circuit board structure of the micro-inverter PCBA of the utility model has the following composition:

[0007] In the printed circuit board structure of the micro-inverter PCBA, the micro-inverter includes a flyback circuit, a rectifier circuit, an inverter circuit, a relay, and a filter circuit connected in sequence. The input end of the flyback circuit is connected to a DC voltage. The flyback circuit includes a transformer. The output end of the filter circuit is connected to the grid. The printed circuit board structure includes a substrate. The transformer is arranged at the center line position on the front side of the substrate. On one side of the transformer, the front side of the substrate and the back side of this side are the primary element areas of the transformer. On the other side of the transformer, the front side of the substrate and the back side of this side are the secondary element areas of the transformer. The area of this printed circuit board is less than 505 cm 2 .

[0008] In the PCBA printed circuit board structure of the micro-inverter, a flyback circuit is provided on the front side of the substrate in the primary component area, and a primary MOS tube is provided on the back side of the substrate in the primary component area; a filter circuit and a relay are provided on the front side of the substrate in the secondary component area, and a rectifier circuit, an inverter circuit, and a secondary MOS tube are provided on the back side of the substrate in the secondary component area.

[0009] In the PCBA printed circuit board structure of the micro-inverter, a primary CPU chip is further provided on the back side of the substrate in the primary component area; a PLCC communication transformer is further provided on the front side of the substrate in the secondary component area; a secondary MCU chip and a PLCC chip are further provided on the back side of the substrate in the secondary component area.

[0010] In the PCBA printed circuit board structure of the micro-inverter, the mass of the printed circuit board structure of the micro-inverter is less than 1 kg, and the overall mass of the circuit board with components is less than 1.2 kg.

[0011] In the PCBA printed circuit board structure of the micro-inverter, the center of gravity of the printed circuit board structure of the micro-inverter is located at the position where the transformer is provided in the middle of the front side of the substrate.

[0012] In the PCBA printed circuit board structure of the micro-inverter of the present utility model, the transformer is arranged at the center line position of the front side of the substrate. On one side of the transformer, the front side and the back side of the substrate are the primary component area of the transformer, and on the other side is the secondary component area of the transformer, so that the components are evenly distributed, ensuring the center of gravity balance of the PCBA. At the same time, the area is less than 505 cm 2 , and the weight is controlled to make the PCBA as a whole small and compact, facilitating subsequent assembly and application. Moreover, the structure of the PCBA printed circuit board structure of the micro-inverter of the present utility model is simple and the cost is low, and it can be widely applied to various application occasions of high-power photovoltaic products. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a front view schematic diagram of the PCBA printed circuit board structure of the micro-inverter of the present utility model;

[0014] Figure 2 is a back view schematic diagram of the PCBA printed circuit board structure of the micro-inverter of the present utility model.

[0015] Reference Numerals:

[0016] 1 Main Transformer,

[0017] 2 Electrolytic Capacitor,

[0018] 3 Common Mode Inductor,

[0019] 4 Mode Capacitor,

[0020] 5 wifi communication module,

[0021] 6 auxiliary power transformer,

[0022] 7 common mode inductor,

[0023] 8 relay,

[0024] 9 varistor,

[0025] 10-mode capacitor,

[0026] 11 PLCC communication transformer,

[0027] 12-mode capacitor,

[0028] 21 thyristor,

[0029] 22 secondary side MOS tube,

[0030] 23 rectifier tube,

[0031] 24 primary side MOS tube,

[0032] 25 primary side chip CPU,

[0033] 26 secondary side MCU,

[0034] 27 PLCC chip. Detailed implementation mode

[0035] In order to more clearly understand the technical content of the present invention, the following embodiments are specifically described in detail.

[0036] Please refer to Figure 1 As shown, it is a front view schematic diagram of the PCBA printed circuit board structure of the micro-inverter of the present invention.

[0037] In one implementation mode, the PCBA printed circuit board structure of the micro-inverter includes a flyback circuit, a rectifier circuit, an inverter circuit, a relay and a filter circuit connected in sequence. The input end of the flyback circuit is connected to a DC voltage. The flyback circuit includes a transformer. The output end of the filter circuit is connected to the power grid. The printed circuit board structure is as Figure 1 and Figure 2 shown, and includes a substrate. The transformer is arranged at the center line position of the front side of the substrate ( Figure 1 shown by the central dotted line). On one side of the transformer, the front side of the substrate and the back side of this side are the primary side component areas of the transformer. On the other side of the transformer, the front side of the substrate and the back side of this side are the secondary side component areas of the transformer.

[0038] The components on the front side of the substrate include: main transformer 1, electrolytic capacitor 2, common mode inductor 3, film capacitor 4, wifi communication module 5, auxiliary power transformer 6, common mode inductor 7, relay 8, varistor 9, film capacitor 10, PLCC communication transformer 11, and film capacitor 12. The area of this printed circuit board is less than 505 cm 2 . In the preferred case, the size of this printed circuit board is 280.2 mm × 180 mm.

[0039] The components on the back side of the substrate include: thyristor 21, secondary side mos tube 22, rectifier tube 23, primary side mos tube 24, primary side chip CPU 25, secondary side MCU 26, and PLCC chip 27.

[0040] As Figure 1 and Figure 2 shown, in the preferred embodiment, the flyback circuit is provided on the front side of the substrate in the primary component area, and the primary side mos tube 22 is provided on the back side of the substrate in the primary component area; the filter circuit and the relay are provided on the front side of the substrate in the secondary component area, and the rectifier circuit, the inverter circuit, and the secondary side mos tube 22 are provided on the back side of the substrate in the secondary component area.

[0041] Furthermore, a primary CPU chip is also provided on the back side of the substrate in the primary component area; a PLCC communication transformer is also provided on the front side of the substrate in the secondary component area; a secondary side MCU chip and a PLCC chip are also provided on the back side of the substrate in the secondary component area.

[0042] In a more preferred embodiment, the mass of the printed circuit board structure of this micro-inverter is about 780 g, and the overall mass of the circuit board with components is about 1184 g, which is less than 1.2 kg.

[0043] And the center of gravity of the printed circuit board structure of this micro-inverter is located at the position where the transformer is provided in the middle of the front side of the substrate.

[0044] In practical applications, since the transformer on the printed circuit board structure of the micro-inverter PCBA of the present utility model is provided at the center line position on the front side of the substrate, and other components are evenly distributed, ensuring the center of gravity balance of the PCBA. In the subsequent packaging process, it can be conveniently connected to the cable and can be stably placed in the micro-inverter housing. Even in the case of filling thermal conductive glue, etc., it can ensure the stable balance of the center of gravity of the packaged micro-inverter, and can be safely and stably fixed at the designed position when installed in a photovoltaic product. At the same time, even when applied to high-power scenarios, the size and weight of the printed circuit board structure of the micro-inverter PCBA of the present utility model are still controlled within a small range, making the product more compact and having lower requirements for the installation space.

[0045] The PCBA printed circuit board structure of the micro-inverter adopting the utility model has a transformer arranged at the center line position on the front side of the substrate. On one side of the transformer, the front side and the back side of the substrate are the primary component areas of the transformer, and on the other side are the secondary component areas of the transformer, so that the components are evenly distributed, ensuring the center of gravity balance of the PCBA. At the same time, the area is less than 200 cm 2 , and the weight is controlled to make the whole PCBA small and convenient for subsequent assembly and application. Moreover, the structure of the PCBA printed circuit board structure of the micro-inverter of the utility model is simple and the cost is low, and it can be widely applied to various high-power photovoltaic product application occasions.

[0046] In this specification, the utility model has been described with reference to its specific embodiments. However, it is obvious that various modifications and variations can still be made without departing from the spirit and scope of the utility model. Therefore, the specification and the drawings should be regarded as illustrative rather than restrictive.

Claims

1. A micro inverter PCBA printed circuit board structure, the printed circuit board structure comprises a flyback circuit, a rectifier circuit, an inverter circuit, a relay and a filter circuit connected in sequence, the input end of the flyback circuit is connected to a DC voltage, the flyback circuit comprises a transformer, the output end of the filter circuit is connected to a power grid, the printed circuit board structure comprises a substrate, characterized in that: The transformer is arranged at the center line position of the front side of the substrate, the front side of the substrate on one side of the transformer and the back side of the substrate are the primary side component area of ​​the transformer, the front side of the substrate on the other side of the transformer and the back side of the substrate are the secondary side component area of ​​the transformer, and the area of ​​the printed circuit board is less than 505cm 2 .

2. The micro inverter PCBA printed circuit board structure according to claim 1, characterized in that: The flyback circuit is arranged on the front side of the substrate in the primary element area, and the primary MOS tube is arranged on the back side of the substrate in the primary element area; the filter circuit and relay are arranged on the front side of the substrate in the secondary element area, and the rectifier circuit, inverter circuit and secondary MOS tube are arranged on the back side of the substrate in the secondary element area.

3. The micro inverter PCBA printed circuit board structure according to claim 2, characterized in that: A primary CPU chip is also arranged on the back of the substrate in the primary component area; a PLCC communication transformer is also arranged on the front of the substrate in the secondary component area; and a secondary MCU chip and a PLCC chip are also arranged on the back of the substrate in the secondary component area.

4. The micro inverter PCBA printed circuit board structure according to claim 1, characterized in that: The mass of the micro inverter PCBA printed circuit board structure is less than 1kg.

5. The micro inverter PCBA printed circuit board structure according to claim 4, characterized in that: The center of gravity of the micro inverter PCBA printed circuit board structure is located in the middle of the front side of the substrate where the transformer is arranged.

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